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Driver of Semiconductor laser for 1Gbit/s
Melichárek, Radek ; Vařacha, František (referee) ; Prokeš, Aleš (advisor)
This thesis describes a design of a driver for a specific type of laser VCSEL. Models for simulation in PSpice OrCAD have been developed for this type of laser. The qualities of the designed driver aim to be equal to the integrated drivers that are available and to remove some of their drawbacks. It consists of the following components: input LVPECL receiver/driver, differential amplifier, fixed source of a modulation current, circuit of automatic power control. Regulation of the modulation current is dealt with atypically using an aptly selected input LVPECL receiver/driver which enables to control the voltage amplitude on its output by means of voltage. The thesis also describes different types of coupling between laser and driver. The most appropriate alternative is selected taking into consideration the unconventional design of the driver. The connection of the driver is supplemented by a microcontroller which secures control of output optical power by means of a serial bus RS232.
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Semiconductor laser driver for 1Gbit/s
Chlachula, Filip ; Křivák, Petr (referee) ; Prokeš, Aleš (advisor)
This master´s thesis deals with a solution of the driving circuits of semiconductor laser. In the beginning of the thesis there is an analysis of semiconductor lasers and its characteristics. Then the principle of laser diodes and its excitation is described. This thesis is focused on semiconductor laser excitation through the use of direct and modulating current. Several circuits are described, designed and simulated. The best resulting circuit is realized and measured in the laboratory.
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Driver of Semiconductor laser for 1Gbit/s
Melichárek, Radek ; Vařacha, František (referee) ; Prokeš, Aleš (advisor)
This thesis describes a design of a driver for a specific type of laser VCSEL. Models for simulation in PSpice OrCAD have been developed for this type of laser. The qualities of the designed driver aim to be equal to the integrated drivers that are available and to remove some of their drawbacks. It consists of the following components: input LVPECL receiver/driver, differential amplifier, fixed source of a modulation current, circuit of automatic power control. Regulation of the modulation current is dealt with atypically using an aptly selected input LVPECL receiver/driver which enables to control the voltage amplitude on its output by means of voltage. The thesis also describes different types of coupling between laser and driver. The most appropriate alternative is selected taking into consideration the unconventional design of the driver. The connection of the driver is supplemented by a microcontroller which secures control of output optical power by means of a serial bus RS232.
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Semiconductor laser driver for 1Gbit/s
Chlachula, Filip ; Křivák, Petr (referee) ; Prokeš, Aleš (advisor)
This master´s thesis deals with a solution of the driving circuits of semiconductor laser. In the beginning of the thesis there is an analysis of semiconductor lasers and its characteristics. Then the principle of laser diodes and its excitation is described. This thesis is focused on semiconductor laser excitation through the use of direct and modulating current. Several circuits are described, designed and simulated. The best resulting circuit is realized and measured in the laboratory.
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Vláknové mřížky pro zvýšení stability polovodičových laserů
Mikel, Břetislav ; Číp, Ondřej
The industrial production of Vertical Cavity Surface Emittíng Laser (VCSEL) diodes started several years ago. They have a wide range of applications in laser interferometry and spectroscopy. At present VCSELs become very attractive in optical communications in Wavelength Division Multiplexing (WDM) systems. The influence of the external optical feedback on spectral characteristics of VCSELs has been studied. At present the most interesting solution of this external feedback is to use an external fiber with fíber grating. Thanks to advances in technology of fabrication of fiber gratings they can be used as the external cavity for edge emitting laser diodes and as well as for VCSELs. Study of linewidth improvement, frequency stability, and mechanical stability are growing in importance in connection with fiber gratings
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